Pension Plans And Other Post-Retirement Benefits (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Lump sum paid		$ 10,197	$ 14,872
Expected return on plan assets		6.50%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement loss			$ (5,931)
Expected return on plan assets		6.50%	6.75%	7.00%
Fair value of plan assets		$ 266,461	$ 239,007	$ 270,353
2015 expected contribution		13,542
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		54,011	45,422	47,750
401(k) Savings Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching contribution, annual profit sharing compensation expense		6,259	6,096	$ 5,374
Aqua America Common Stock [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 17,166	$ 12,393
Percentage of plan assets		6.40%	5.10%
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	6.00%